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The effect of double-trace asymmetric eye closure has been observed for the first time to our knowledge in a lightemitting- diode (LED)/single-mode-fiber transmission system when the system is operated in a dispersion-limited mode in the 1300-nm wavelength region. This asymmetric eye degradation can be explained by the asymmetry of the fiber impulse response for LED's with center wavelengths close to the zero dispersion wavelength and was eliminated by the insertion of an optical high-pass filter of 1245 nm.
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Stern et al. (1986) studied this question.
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